<template>
    <div>
         <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品分类</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区 -->
        <el-card>
            <el-row>
                <el-col>
                    <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
                </el-col>
            </el-row>

            <!-- 表格区 -->
            <tree-table class="treeTable" :data="catelist" :columns="columns" :selection-type="false" :expand-type="false" show-index index-text="#" border :show-row-hover="false">
                <!-- 是否有效 -->
                <template slot="isok" slot-scope="scope">
                  <i class="el-icon-success" v-if="scope.row.cat_deleted === false" style="color: lightgreen"></i>
                  <i class="el-icon-error" v-else style="color: lightgreen"></i>
                </template>
                <!-- 排序 -->
                <template slot="order" slot-scope="scope">
                   <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
                   <el-tag size="mini" type="success" v-else-if="scope.row.cat_level === 1">二级</el-tag>
                   <el-tag size="mini" type="warning" v-else>三级</el-tag>
                </template>
                <!-- 操作 -->
                <template slot="opt" slot-scope="scope">
                    <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditCateDialogVisible(scope.row.cat_id)">编辑</el-button>
                    <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeCate(scope.row.cat_id)">删除</el-button>
                </template>
            </tree-table>
            <!-- 分页区 -->
            <el-pagination
                @size-change="handleSizeChange"
                @current-change="handleCurrentChange"
                :current-page="querInfo.pagenum"
                :page-sizes="[3, 5, 10, 15]"
                :page-size="querInfo.pagesize"
                layout="total, sizes, prev, pager, next, jumper"
                :total="total">
            </el-pagination>
        </el-card>
        <!-- 添加分类对话框 -->
        <el-dialog
        title="添加分类"
        :visible.sync="addCateDialogVisible"
        width="50%" @close="addCateDialogClosed">
            <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="70px">
                <el-form-item label="分类名称" prop="cate_name">
                    <el-input v-model="addCateForm.cate_name"></el-input>
                </el-form-item>
                <el-form-item label="父级分类" >
                    <el-cascader
                        v-model="selectedKeys"
                        :options="parentCateList"
                        :props="{ expandTrigger: 'hover', value: 'cat_id', label: 'cat_name', children: 'children', checkStrictly: 'true'}"
                        @change="parentCatChanged"></el-cascader>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addCateDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addCate">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 编辑商品分类的对话框 -->
        <el-dialog
        title="编辑商品"
        :visible.sync="editCateDialogVisible"
        width="50%" @close="editCateDialogClosed">
            <el-form :model="editCateForm" :rules="addCateFormRules" ref="editCateFormRef" label-width="70px">
                <el-form-item label="分类名称" prop="cate_name">
                    <el-input v-model="editCateForm.cat_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editCateDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editCate">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 商品分类数据列表
            catelist: [],
            // 查询条件
            querInfo: {
                type: 3,
                pagenum: 1,
                pagesize: 5,
            },
            // 总数据条数
            total: 0,
            // 为table指定列的定义
            columns: [{
                label: '分类名称',
                prop: 'cat_name'
            },{
                label:'是否有效',
                // 将当前列定义为模板列
                type: 'template',
                // 表示当前这一列使用模板名称
                template: 'isok'
            },
            {
                label:'排序',
                // 将当前列定义为模板列
                type: 'template',
                // 表示当前这一列使用模板名称
                template: 'order'
            },
            {
                label:'操作',
                // 将当前列定义为模板列
                type: 'template',
                // 表示当前这一列使用模板名称
                template: 'opt'
            }
            ],
            // 控制添加分类对话框的显示与隐藏
            addCateDialogVisible: false,
            editCateDialogVisible: false,
            // 添加分类的表单数据对象
            addCateForm: {
                cat_name: '',
                // 父级分类的ID
                cat_pid: 0,
                // 分类等级默认一级分类
                car_level: 0,
            },
            // 添加分类表单验证
            addCateFormRules: {
                cat_name: [
                    {required: true, message: "请输入分类的名称", trigger: 'blur'}
                ]
            },
            // 父级分类列表
            parentCateList: [],
            // 指定级联选择器的配置对象
            selectedKeys: [],
            editCateForm: {
                
            },
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取商品分类数据
        async getCateList() {
            const{data:res} = await this.$http.get('categories', {params: this.querInfo})
            if(res.meta.status !== 200) {
                return this.$message.error('获取商品分类失败！')
            }
            this.catelist = res.data.result
            this.total = res.data.total
        },
        // 监听pagesize改变的函数
        handleSizeChange(newsize) {
            this.querInfo.pagesize = newsize
            this.getCateList()
        },
        // 监听pagenume改变
        handleCurrentChange(newpage){
            this.querInfo.pagenum = newpage
            this.getCateList
        },
        // 点击按钮出现对添加商品分类话框
        showAddCateDialog(){
            this.getparentCateList()
            this.addCateDialogVisible = true
        },
        // 获取父级分类的数据列表
        async getparentCateList(){
           const {data:res} = await this.$http.get('categories', {params: {type: 2}})
            if(res.meta.status !== 200){
                return this.$message.error('获取父级分类数据失败！')
            }
            this.parentCateList = res.data
        },
        // 选择项发生变化触发这个函数
        parentCatChanged() {
            // 如果selectedKeys 数组中length大于0 证明选中父级分类
            if(this.selectedKeys.length > 0){
                this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length -1]
                this.addCateForm.cat_level = this.selectedKeys.length
                return
            }else {
                this.addCateForm.cat_pid = 0
                this.addCateForm.cat_level = 0
            }
        },
        setRoleDialogClosed() {
           this.$refs.addCateFormRef.resetFields()

        },
        editCateDialogClosed(){
            this.$refs.editCateFormRef.resetFields()
        },
        // 点击按钮添加新的分类
        addCate(){
            this.$refs.addCateFormRef.validate( async valid =>{
                if(!valid)return
                const {data:res} = await this.$http.post('categories', this.addCateForm)
                if(res.meta.status !==201){
                    return this.$message.error('添加分类失败')
                }
                this.$message.success('添加分类成功')
                this.getCateList()
                this.addCateDialogVisible = false;
            }) 
    
        },
        // 监听对话框关闭
        addCateDialogClosed(){
            this.$refs.addCateFormRef.resetFields()
            this.selectedKeys = []
            this.addCateForm.cat_pid = 0
            this.addCateForm.cat_level = 0
        },
        // 编辑商品
        async showEditCateDialogVisible(id) {
            const {data:res} = await this.$http.get('categories/' + id)
            if(res.meta.status !== 200){
                return this.$message.error('ID查询商品错误')
            }
            this.editCateForm = res.data
            
            this.editCateDialogVisible = true
        },
        editCate(){
            this.$refs.editCateFormRef.validate( async valid =>{
                if(!valid){
                    return this.$message.error('请输入正确的内容')
                }
                const{data:res} = await this.$http.put('categories/'+ this.editCateForm.cat_id,{
                    cat_name: this.editCateForm.cat_name
                })
                if(res.meta.status !==200 )return this.$message.error('编辑失败')
                this.$message.success('编辑成功')
                this.getCateList()
                this.editCateDialogVisible = false
            })
        }
    },
}
</script>

<style lang="less" scoped>
.treeTable {
    margin-top: 15px;
}
.el-cascader {
    width: 100%;
}
</style>
